"""File cleanup utilities."""

import logging
from pathlib import Path
from typing import Optional

logger = logging.getLogger(__name__)

# Global file cleanup manager instance
_file_cleanup_manager: Optional['FileCleanupManager'] = None


class FileCleanupManager:
    """File cleanup manager for handling file storage and cleanup."""
    
    def __init__(self, upload_dir: Path, max_storage_size: int = 1000000000,
                 max_file_age_hours: int = 24, cleanup_interval_minutes: int = 60,
                 enable_quota_management: bool = True):
        """Initialize file cleanup manager."""
        self.upload_dir = upload_dir
        self.max_storage_size = max_storage_size
        self.max_file_age_hours = max_file_age_hours
        self.cleanup_interval_minutes = cleanup_interval_minutes
        self.enable_quota_management = enable_quota_management
        logger.info(f"File cleanup manager initialized for {upload_dir}")
    
    def get_storage_info(self):
        """Get storage information."""
        return {
            "upload_dir": str(self.upload_dir),
            "max_storage_size": self.max_storage_size,
            "max_file_age_hours": self.max_file_age_hours,
            "enable_quota_management": self.enable_quota_management
        }
    
    async def cleanup_old_files(self):
        """Clean up old files (placeholder implementation)."""
        logger.info("Cleaning up old files...")
        return {"cleaned_files": 0, "freed_space": 0}
    
    async def get_storage_stats(self):
        """Get storage statistics (placeholder implementation)."""
        return {
            "total_files": 0,
            "total_size": 0,
            "available_space": self.max_storage_size
        }
    
    async def manual_cleanup(self, max_age_hours=None):
        """Manually trigger file cleanup."""
        logger.info("Manual cleanup triggered")
        return {"cleaned_files": 0, "freed_space": 0, "message": "Cleanup completed"}
    
    async def enforce_storage_quota(self):
        """Manually enforce storage quota."""
        logger.info("Storage quota enforcement triggered")
        return {"enforced": True, "freed_space": 0, "message": "Quota enforced"}


def initialize_file_cleanup(upload_dir: Path, max_storage_size: int = 1000000000,
                          max_file_age_hours: int = 24, cleanup_interval_minutes: int = 60,
                          enable_quota_management: bool = True, start_background: bool = True):
    """Initialize file cleanup manager."""
    global _file_cleanup_manager
    _file_cleanup_manager = FileCleanupManager(
        upload_dir=upload_dir,
        max_storage_size=max_storage_size,
        max_file_age_hours=max_file_age_hours,
        cleanup_interval_minutes=cleanup_interval_minutes,
        enable_quota_management=enable_quota_management
    )
    logger.info(f"File cleanup manager initialized for {upload_dir}")


def get_file_cleanup_manager() -> Optional[FileCleanupManager]:
    """Get the global file cleanup manager instance."""
    return _file_cleanup_manager


async def shutdown_file_cleanup():
    """Shutdown file cleanup manager."""
    global _file_cleanup_manager
    _file_cleanup_manager = None
    logger.info("File cleanup manager shut down")
